Abstract
THE velocity of a moving object may be determined by taking two photographs of it on the same photographic emulsion separated by a known interval of time and measuring the distance through which the image has moved. Double-exposure photography of non-luminous objects can be carried out with transmitted light where the camera lens is presented with a silhouette of the object against a light background, or with some other type of lighting such as frontal illumination, where the object appears bright against a dark background.
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References
Dombrowski, N., Brit. J. App. Phys., 6, 17 (1955).
Aspden, R. L., Proc. Third Intern. Cong. High Speed Photography, 370 (Butterworths Scientific Publications, London, 1957).
Courtney-Pratt, J. S., J. Phot. Sci., 7, 18 (1959).
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DOMBROWSKI, N., LEVY, A. Double-exposure Photography. Nature 202, 521 (1964). https://doi.org/10.1038/202521a0
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DOI: https://doi.org/10.1038/202521a0
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